[MPlayer-users] VOB aspect ratio mystery

[Pádraig Brady]

Nico Sabbi wrote:
> how can we know without log and sample to analyze?

Sorry, here are 3 VOB files run with mplayer-1.0-0.91.20080531svn.lvn8
As you can see it's identifying two of them as 16:9 even though
they all have aspect 2 in the MPEG stream:

$ mplayer VTS_06_0.VOB -msglevel all=9 -identify 2>&1 | grep -Fi aspect
VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  9800.0 kbps (1225.0 kbyte/s)
ID_VIDEO_ASPECT=0.0000
[ffmpeg] aspect_ratio: 1.777778
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=1.7778

$ mplayer VTS_01_1.VOB -msglevel all=9 -identify 2>&1 | grep -Fi aspect
VIDEO:  MPEG2  720x576  (aspect 2)  25.000 fps  9800.0 kbps (1225.0 kbyte/s)
ID_VIDEO_ASPECT=0.0000
[ffmpeg] aspect_ratio: 1.333333
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=1.3333

$ mplayer DVD-VR.VOB -msglevel all=9 -identify 2>&1 | grep -Fi aspect
VIDEO:  MPEG2  720x576  (aspect 2)  25.000 fps  8800.0 kbps (1100.0 kbyte/s)
ID_VIDEO_ASPECT=0.0000
[ffmpeg] aspect_ratio: 1.777778
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=1.7778

The VOBs can be downloaded at:
http://www.pixelbeat.org/tmp/mplayer-mpeg2-aspect/

cheers,
Pádraig.